I think I know where some tv shows are. A web site named pointofreason.com has a bunch of the Lucy shows on tap(about 30 in number) and a few live shows (a Timex program
of Frank Sinata with Dean Martin and Bing Crosby). This may help.
Thanks. Shokus Video has some rare PD stuff (Although be careful, since some of the stuff they sell is copyrighted). The PD episodes of "I Married Joan" and "Love That Bob" are available as $1 DVDs, so I'm surprised nobody has uploaded any episodes of them yet. Oh yeah, avoid Alpha Video DVDs, since they have a watermark (Damn It!).